<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>取得结果集中字段的数目</title>
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-base.css" />
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-medium.css" />

 </head>
 <body class="docs"><div class="navbar navbar-fixed-top">
  <div class="navbar-inner clearfix">
    <ul class="nav" style="width: 100%">
      <li style="float: left;"><a href="function.mysql-list-tables.html">« mysql_list_tables</a></li>
      <li style="float: right;"><a href="function.mysql-num-rows.html">mysql_num_rows »</a></li>
    </ul>
  </div>
</div>
<div id="breadcrumbs" class="clearfix">
  <ul class="breadcrumbs-container">
    <li><a href="index.html">PHP Manual</a></li>
    <li><a href="ref.mysql.html">MySQL 函数</a></li>
    <li>取得结果集中字段的数目</li>
  </ul>
</div>
<div id="layout">
  <div id="layout-content"><div id="function.mysql-num-fields" class="refentry">
   <div class="refnamediv">
    <h1 class="refname">mysql_num_fields</h1>
    <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_num_fields</span> &mdash; <span class="dc-title">取得结果集中字段的数目</span></p>

   </div>
   <div class="refsect1 unknown-seealsp" id="refsect1-function.mysql-num-fields-unknown-seealsp">
    <h3 class="title">说明</h3>
     <div class="methodsynopsis dc-description">
      <span class="methodname"><strong>mysql_num_fields</strong></span>(<span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>): <span class="type">int</span></div>

    <p class="para rdfs-comment">
     <span class="function"><strong>mysql_num_fields()</strong></span>
     返回结果集中字段的数目。
    </p>
    <p class="para">
     参见
     <span class="function"><a href="function.mysql-select-db.html" class="function">mysql_select_db()</a></span>，<span class="function"><a href="function.mysql-query.html" class="function">mysql_query()</a></span>，<span class="function"><a href="function.mysql-fetch-field.html" class="function">mysql_fetch_field()</a></span> 和
     <span class="function"><a href="function.mysql-num-rows.html" class="function">mysql_num_rows()</a></span>。
    </p>
    <p class="para">
     为向下兼容仍然可以使用
     <span class="function"><strong>mysql_numfields()</strong></span>，但反对这样做。
    </p>
   </div>

  </div></div></div></body></html>